However, phylogenetic trees or evolutionary trees are hypothesized constructions. Scientists compare anatomy, embryos and DNA data to determine the evolutionary history of organisms and build phylogenetic trees. Natural selection and adaptation lead organisms to survive or become extinct from the environment. However, environment also has a great influence on organisms’ characteristics. When critically analyzing and comparing their similarities, evidence can be identified about their evolutionary relationships. Biologists state that all living organisms must share a single last common ancestor.
Similarities between organisms and structures are believed to be inherited from a common ancestor.
Key Difference – Homologous vs Analogous Structures
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